KR100423583B1 - Optical disk drive apparatus - Google Patents

Abstract

The present invention provides an optical disk drive device, a balancer for an optical disk drive device, a balancer for an optical disk drive device, a motor and an optical disk drive device that enable stable storage and reproduction by suppressing undesirable vibration and noise caused by an imbalance of an optical disk as a removable recording medium. It relates to a clamper for use, characterized in that a balancer is provided which is integrally rotatable to an optical disk mounted in an optical disk drive and has a hollow annular portion containing a plurality of spherical bodies or liquids.

Description

Optical disc drive device {OPTICAL DISK DRIVE APPARATUS}

The present invention provides an optical disk drive device, a balancer for an optical disk drive device, a balancer for an optical disk drive device, a motor and an optical disk drive device that enable stable storage and reproduction by suppressing undesirable vibration and noise caused by an imbalance of an optical disk as a removable recording medium. It relates to a clamper for.

Recently, in an optical disc drive apparatus for driving an optical disc such as a removable recording medium (e.g., CD-ROM), there is a trend to increase the rotational speed of an optical disc in order to increase the data transfer rate. However, the optical disc has a weight nonuniformity due to the nonuniformity in thickness and the like. If such an optical disc rotates at a high speed, an uneven centrifugal force (unbalance force) is exerted on the optical disc rotation center, and the vibration caused by the unbalance force propagates to the whole apparatus. Since the amount of unbalance force increases in proportion to the square of the rotation frequency, the vibration increases rapidly as the rotation speed of the optical disk increases. Therefore, the optical disk rotating at high speed has a problem that noise is generated by vibration, the bearing of the spindle motor for driving the optical disk is damaged, and stable recording and reproduction are impossible. Another problem is that when the optical disc drive device is mounted in a computer or the like, vibrations are transmitted to other peripheral devices, causing adverse effects.

Therefore, in order to increase the data transfer rate by increasing the optical disk rotation speed, it is necessary to suppress undesirable vibration caused by the optical disk imbalance.

An example of a conventional optical disc drive device will be described below with reference to the drawings.

24 is a perspective view showing a conventional optical disc drive device. In FIG. 24, the optical disc 1 is rotationally driven by the spindle motor 2, and the head 3 reads data recorded on the optical disc 1 or writes data on the optical disc 1. The head drive mechanism 5 is composed of a rack, pinion, and the like, and converts the rotational movement of the head drive motor 4 into a linear motion transmitted to the head 3. By this head drive mechanism 5, the head 3 moves radially across the optical disc 1. The spindle motor 2, the head drive motor 4 and the head drive mechanism 5 are mounted on the sub base 6. Vibrations and shocks transmitted from the outside of the device to the subbase 6 are cushioned by an insulator 7: an elastic body; The sub base 6 is mounted on the main base 8 via the insulator 7. The main portion of the optical disc drive device is configured to be mounted inside a computer device or the like using the frame 9 attached to the main base 8.

25 is a side sectional view showing the vicinity of the spindle motor 2 in the conventional optical disc drive device. The turntable 110 is fixed to the axis of the spindle motor 2 and supports the clamp region 11 of the optical disc 1 in a rotatable manner. A boss 14 engaging with the clamp hole 12 in the optical disc 1 is formed integrally with the turntable 110. Centering of the optical disc 1 is achieved by combining the boss 14 and the optical disc 12. The positioning hole 113 is formed in the upper part of the boss 14, and the opposing yoke 15 is fixed.

The clamper 116 has a centering center 17 for centering, which engages with the positioning hole 113 formed in the turntable 110, and an annular magnet 18 is fixed around it. Flat contacts 19 in contact with the optical disc 1 are formed on the lower surface of the clamper 116.

In the conventional optical disc drive device configured as described above, when loading the optical disc 1, the optical disc 1 is placed on the turntable 110 with the clamp hole 12 engaged with the boss 14. At this time, the optical disc 1 is fixed in place by a suction force acting between the opposing yoke 15 fixed to the turntable 11 and the magnet 18 installed in the clamper 116. The optical disk 1 thus fixed is rotationally driven by the spindle motor 2 integrally with the turntable 110 and the clamper 116. When the optical disc 1 is dismounted, the clamper 116 and the turntable 11 are driven by the driving force of the optical disc loading motor (not shown) in a direction away from each other, so that the optical disc 1 is in a removable state. It becomes

However, in the above-described configuration of the optical disk drive apparatus, if the optical disk 1 contains weight unevenness due to thickness unevenness or the like, the optical disk 1 shown in FIG. 25 when the optical disk 1 rotates at high speed The centrifugal force (unbalance force) F acts on the center of gravity G1 of. This imbalance force F is transmitted to the sub base 6 via the turntable 110 and the spindle motor 2; Since the sub base 6 is supported on the insulator 7 formed of an elastic material, the sub base 6 is vibrated severely by an unbalanced force. Since the amount of imbalance force F is proportional to the product of the square of the rotational frequency and its imbalance amount (in gcm), the vibration acceleration of the subbase 6 also increases rapidly in proportion to the approximately square of the rotational frequency of the optical disc 1. do. As a result, noise is generated by the resonance of the subbase 6 itself and the head drive mechanism 5 mounted on the subbase 6, and the optical disc 1 and the head 3 vibrate violently, resulting in stable recording. And reproduction is impossible.

In order to solve this problem, in the conventional optical disc drive device, the vibration amount of the sub base is increased by inserting an elastic body such as a leaf spring between the sub base 6 and the main base 8 or increasing the elastic modulus of the insulator. Means of decreasing were adopted. However, when the strength of the joint between the subbase 6 and the main base is increased, when vibrations or shocks are applied from the outside of the device, the vibrations or shocks are attached to the optical disc 1, the head 3, or the like. Direct transmission to the subbase 6 leads to the problem that stable recording and reproducing are impossible, and the vibration resistance and impact resistance of the apparatus are deteriorated.

The above-described means further provides that the vibration of the sub base 6 caused by the imbalance force F is transmitted to the outside of the optical disc drive device through the main base 8 and the frame 9, thereby driving the optical disc mounted inside the computer device. It includes the problem of adversely affecting other devices besides the device. In addition, a large lateral pressure is exerted on the bearings of the spindle motor 2 by the imbalance force F, which increases the bearing damage torque and causes the bearing to be damaged, which in turn shortens the bearing life.

In view of the above problems, the present invention enables stable recording or reproducing even when an unbalanced optical disc is rotating at high speed, and has a high reliability against shock and vibration from the outside of the device. An optical disk drive device, a balancer for an optical disk drive device, a motor for an optical disk drive device, and a clamper for an optical disk drive device in which a high data transfer rate can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side sectional view showing the vicinity of a spindle motor 2 in an optical disc drive device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the hollow annular portion 23 provided on the clamper 16a in the optical disk drive device of the first embodiment shown in FIG.

3 is an explanatory diagram showing a case where the central axis P2 of the outer circumferential wall 25 is displaced from the rotation center axis P0 of the spindle motor.

4 shows measured vibration acceleration values of the subbase 6 to show the effect of the first embodiment of the present invention.

Fig. 5 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing the hollow annular portion 23 provided on the clamper 16a in the optical disk drive device of the second embodiment shown in FIG.

Fig. 7 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the third embodiment of the present invention.

FIG. 8 is a cross-sectional view showing hollow annular portions 23a and 23b provided on the clamper 16a in the optical disk drive device of the third embodiment shown in FIG.

FIG. 9 shows hollow annular portions 23a and 23b for explaining positions of the spherical body 24 and the liquid 26 when the mass disc imbalance of the optical disk 1 is small in the third embodiment shown in FIG. )

Fig. 10 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the fourth embodiment of the present invention.

Fig. 11 is a sectional view showing the hollow annular portion 23 provided on the clamper in the optical disk drive apparatus according to the fifth embodiment of the present invention.

Fig. 12 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the sixth embodiment of the present invention.

Fig. 13 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the seventh embodiment of the present invention.

Fig. 14 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the eighth embodiment of the present invention.

Fig. 15 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the ninth embodiment of the present invention.

Fig. 16 is a plan sectional view showing the vicinity of the electromagnet 40 and the hollow annular portion 23 provided on the turntable 10c in the optical disk drive device of the ninth embodiment shown in Fig. 14;

Fig. 17 is a side sectional view showing the vicinity of the turntable 110 in the optical disc drive device according to the tenth embodiment of the present invention.

Fig. 18 is a side sectional view showing the vicinity of the clamper 16d and the turntable 110 in the optical disc drive device according to the eleventh embodiment of the present invention.

Fig. 19 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the twelfth embodiment of the present invention.

Fig. 20 is a side sectional view showing the vicinity of the turntable 10c in the optical disc drive device according to the thirteenth embodiment of the present invention.

Fig. 21 is a side sectional view showing the vicinity of the turntable 110 in the optical disc drive device according to the fourteenth embodiment of the present invention.

Fig. 22 is a side sectional view showing the vicinity of the turntable 110 in the optical disc drive device according to the fifteenth embodiment of the present invention.

Fig. 23 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the sixteenth embodiment of the present invention.

24 is a perspective view showing a conventional optical disc drive device.

Fig. 25 is a side sectional view showing the vicinity of the spindle motor 2 in the conventional optical disc drive device.

<Description of the symbols for the main parts of the drawings>

1: optical disc 2: spindle motor

6: sub bass 8: main bass

13: positioning hole 16, 16a, 116: clamper

21: spindle axis 22: balancer

23, 23a, 23b: annular portion 24: spherical body

25: outer circumferential wall 26: liquid

40: electromagnet 52,53: elastic body

80: rotor 117: center hole

In order to achieve the above-described problem, the optical disk drive device of the present invention is provided with a balancer which is rotatably installed on an optical disk mounted in the optical disk drive device, and has a plurality of spherical bodies or hollow annular portions containing liquid. Characterized in that provided; Hereinafter, specific means are disclosed.

An optical disc drive device according to the present invention is:

A sub base to which the spindle motor for driving the optical disk rotation is mounted;

A main base to which the sub base is attached through an elastic body,

It is formed to be rotatable integrally with the mounted optical disk, and comprises a balancer having a hollow annular portion in which the balance member is housed.

Therefore, according to the optical disc drive device of the present invention, an optical disc drive device having high vibration resistance and impact resistance characteristics and capable of high-speed data transfer can be achieved.

An optical disc drive device according to the present invention is:

A sub base to which the spindle motor for driving the optical disk rotation is mounted;

A main base to which the sub base is attached through an elastic body,

It is formed to be rotatable integrally with the mounted optical disk, and comprises a balancer having a hollow annular portion sealed with liquid.

Therefore, according to the optical disk drive apparatus of the present invention, vibration of the subbase due to the imbalance of the mounted optical disk can be effectively suppressed.

An optical disc drive device according to the present invention is:

A sub base to which the spindle motor for driving the optical disk rotation is mounted;

A main base to which the sub base is attached through an elastic body,

Is formed rotatably integrally with the mounted optical disk, and comprises a balancer having a plurality of hollow annular portion,

Among the plurality of hollow annular portions, at least one hollow annular portion includes a spherical body therein, and the other hollow annular portion includes a liquid enclosed therein.

Therefore, according to the optical disk drive apparatus of the present invention, the vibration of the subbase can be effectively suppressed regardless of the optical disk having a large or small imbalance.

An optical disc drive device according to the present invention is:

A turntable detachably mounted to rotatably support an optical disc for recording or reproducing data;

A balancer having a hollow ring-shaped portion in which a balance member that exerts a centrifugal force during rotation is movable and hermetically sealed;

It is formed integrally with the balancer, and is provided with a clamper having a rotation center axis substantially coaxial with the central axis of the hollow annular portion by sandwiching the optical disk between the turntable.

Therefore, according to the optical disk drive device of the present invention, vibration of the sub base caused by the imbalance of the mounted optical disk can be suppressed.

An optical disc drive device according to the present invention is:

A turntable integrally formed with the balancer to rotatably support an area for mounting the mounted optical disc;

And a clamper for holding the optical disk together with the turntable.

Therefore, according to the optical disk drive device of the present invention, vibration of the subbase due to the imbalance of the mounted optical disk can be suppressed, and stable recording or reproduction is possible.

In the optical disk drive apparatus according to the present invention, the rotor of the spindle motor is integrally installed in the balancer.

Therefore, according to the optical disk drive apparatus of the present invention, vibration of the subbase due to the imbalance of the mounted optical disk can be suppressed.

According to the optical disc drive device of the present invention, an optical disc drive device capable of high speed rotation and stable reproduction and recording can be achieved without reducing its vibration and shock resistance characteristics.

In the optical disc drive device according to the present invention, the primary resonant frequency of the subbase due to the deformation of the elastic body due to the mechanical vibration in the direction including the plane parallel to the recording surface of the optical disc is set lower than the rotation frequency of the optical disc.

Therefore, according to the optical disc drive device of the present invention, an optical disc drive device capable of high speed rotation and stable reproduction and recording can be achieved without the vibration and shock resistance thereof being reduced.

An optical disc drive device according to the present invention is:

A turntable having a positioning hole for fitting with the spindle axis of the spindle motor to rotatably support the fitting area of the mounted optical disc,

And a clamper having a central axis fitted with the positioning hole, the clamper for holding the optical disc together with the turntable,

The hollow ring-shaped portion is formed coaxially with the central axis of the clamper, characterized in that it comprises a balancer formed integrally with the clamper.

Therefore, according to the optical disk drive apparatus of the present invention, the vibration of the subbase can be further reduced regardless of the large and small imbalance in the optical disk.

An optical disc drive device according to the present invention is:

A turntable having a positioning hole for fitting with the spindle axis of the spindle motor to rotatably support the fitting area of the mounted optical disc,

And a clamper having a center hole fitted with the positioning hole, the clamper for holding the optical disk together with a turntable,

The hollow annular portion is formed coaxially with the center hole of the clamper and has a balancer formed integrally with the clamper.

Therefore, according to the optical disk drive apparatus of the present invention, the vibration of the subbase can be further reduced regardless of the large and small imbalance in the optical disk.

In the optical disc drive device of the present invention, two kinds of spherical bodies of different materials are alternately arranged and stored in the hollow annular portion.

Therefore, the optical disk drive device of the present invention can suppress noise generation from the balancer itself.

In the optical disc drive device according to the present invention, a plurality of metal spherical bodies and elastic spherical bodies are alternately arranged and accommodated in a hollow annular portion.

Therefore, the optical disk drive device of the present invention can suppress the noise generated by the balancer itself.

An optical disc drive device according to the present invention is:

A balancer having a magnetic spherical body housed in a hollow annular body; And magnetic field generating means for sucking and holding the magnetic spherical body.

Therefore, the optical disk drive device of the present invention can suppress the noise generated by the balancer itself.

An optical disc drive device according to the present invention is:

A turn table for rotatably supporting the fitting area of the mounted optical disk, on which the opposite yoke, which is a magnetic plate, is fixed;

And a clamper having a built-in magnet for holding the optical disc with a suction force acting between the opposing yoke, and a balancer having a hollow annular portion in which a magnetic spherical body is accommodated.

Therefore, according to the optical disk drive apparatus of the present invention, not only the vibration of the subbase due to the imbalance of the mounted optical disk, but also the generation of noise from the balancer itself can be suppressed, and the number of components can be minimized.

In the optical disk drive device according to the present invention, the elastic body is fixed around the outer circumferential surface of the magnet which is formed so that the magnetic spherical body is fixed.

Therefore, the optical disc drive device of the present invention can suppress vibration and noise generation from the balancer itself.

The optical disk drive device of the present invention is configured such that an elastic body is fixed to a back yoke, which is a magnetic plate processed on the opposite side of the magnet, from the side facing the opposing yoke, and the magnetic spherical body is fixed to the elastic body of the back yoke.

Therefore, the optical disc drive device of the present invention can suppress the generation and vibration of noise from the balancer itself.

An optical disc drive device according to the present invention is:

A turntable on which a magnet is fixed and rotatably supporting an area in which the mounted optical disk is inserted;

A clamper is integrally formed with a balancer having a hollow annular portion accommodating the opposing yoke for holding the optical disk with suction force acting between the magnet and the magnetic spherical body.

Therefore, according to the optical disk drive apparatus of the present invention, not only the vibration of the subbase due to the imbalance of the mounted optical disk, but also the generation of noise from the balancer itself can be suppressed, and the number of components can be minimized.

The optical disc drive device according to the present invention is configured such that the elastic body is fixed to the opposing yoke embedded in the clamper, and the magnetic spherical body is fixed to the elastic body.

Therefore, the optical disc drive device of the present invention can suppress the generation and vibration of noise from the balancer itself.

In the optical disc drive device according to the present invention, a hollow annular portion for accommodating a spherical body is formed by being combined by an upper case having an opening at a lower side and a lower case having an opening at an upper side thereof, and a balancer of the upper case is formed. An elastic body is provided between the outer peripheral side wall and the outer peripheral side wall of the lower case.

Therefore, the optical disc drive device of the present invention can suppress the generation and vibration of noise from the balancer itself.

In the optical disk drive apparatus according to the present invention, the hollow ring-shaped portion for accommodating the spherical body is formed by being combined by an upper case having an opening at a lower side and a lower case having an opening at an upper side, and a balancer of the upper case is formed. An elastic body is provided between the lower end of the outer peripheral side wall and the bottom surface of the lower case.

Therefore, the optical disc drive device of the present invention can suppress the generation and vibration of noise from the balancer itself.

EXAMPLE

First embodiment

An optical disk driving apparatus according to a first embodiment of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the first embodiment of the present invention. 2 is a cross-sectional view showing only the hollow annular portion 23 provided on the clamper 16a according to the first embodiment of the present invention. 3 is an explanatory diagram showing a case where the central axis P2 of the outer circumferential wall 25 of the hollow annular portion 23 is displaced from the rotational center axis P0 of the spindle motor. 4 is a diagram showing measured vibration acceleration values of the subbase 6 to show the effect of the optical disk drive device of the present invention. Here, the same reference numerals are given to substantially the same reference numerals as in the optical disk drive apparatus shown in FIGS. 24 and 25, and the description thereof is omitted.

1, the optical disc drive device of the first embodiment is configured such that the optical disc 1 on the turntable 110 is fitted at a position fixed by the clamper 16a and rotated by the spindle motor 2. do. In the optical disc drive device, the reading of data recorded on the optical disc 1 and the writing of data to the optical disc 1 are performed by the head. The spindle motor 2, the head drive motor, the head drive mechanism and the like are mounted on the subbase 6.

Vibrations and shocks transmitted from the outside of the device to the subbase 6 are mitigated by the insulator 7 (elastic material); The subbase 6 is mounted on the main base 8 via the insulator 7. The main body of the optical disc drive device is configured to be mounted into a computer or the like using a frame attached to the main base 8.

The turntable 110 is fixed to the shaft 21 of the spindle motor 2 and rotatably supports the region 11 into which the optical disc 1 is fitted. The boss 14 engaging with the support hole 12 in the optical disc 1 is formed integrally with the turntable 110. Centering of the optical disc 1 is achieved by engaging with the boss 14. The opposing yoke 15 is embedded in the top of the boss 14.

The clamper 16a has a central projection 17 for centering, which is engaged with the positioning hole 13 formed in the turntable 110, and a ring-shaped magnet 18 is fixed around it. Flat contact portions 19 in contact with the optical disc 1 are formed on the lower surface of the clamper 16a.

In the optical disc drive device of the first embodiment of the present invention, a spherical balancer 22a is formed on the clamper 16a. As shown in Figs. 1 and 2, the clamper 16a of the first embodiment has a central projection (center axis: 17) formed to achieve positioning with respect to the turntable 110, and the hollow annular portion 23 ) Is provided coaxially with the central protrusion 17. Inside the hollow annular portion 23 a plurality of spherical bodies 24 (e.g. six spherical bodies) are received in a movable manner. The hollow annular member 23 and the spherical body 24 together constitute a spherical balancer 22a, and the spherical balancer 22a is formed integrally with the clamper 16a.

On the other hand, the turntable 110 has a positioning hole 13, which is formed through the turntable 110, and the positioning hole 13 functions as a spindle center axis P0 of the spindle motor 2 as a spindle axis. Is engaged with (21). Accordingly, the turntable 110 is fixed to the spindle shaft 21, and the turntable 110 rotates integrally with the spindle motor 2.

When the disc 1 is to be fitted by the clamper 16a, the optical disc 1 is fitted into the boss 14 on the boss 14, as shown in the case of the conventional optical disc drive shown in FIG. It is held on the turntable 110 together with 12. The optical disc 1 is held in place by a suction force acting between the opposing yoke 15 fixed to the turntable 110 and the magnet 18 fixed to the clamper 16a. At this time, since the positioning is achieved by the center projection (center shaft) 17 formed on the clamper 16a engaged with the positioning hole 13 formed in the turntable 110, the center projection (center shaft) The hollow annular portion 23 provided coaxially with 17 is located substantially coaxially with the rotational center axis P0 of the spindle motor 2. The clamper 16a is rotationally driven by the spindle motor 2 integrally with the optical disc 1 and the turntable 110. When the optical disc 1 is removed, the clamper 16a and the turntable 110 are driven in a direction separated from each other by the driving force of the optical disc loading motor (not shown), and the optical disc 1 is removed.

In addition, in the optical disk drive device of the first embodiment, the insulator (elastic material) 7 having low rigidity is used to connect the subbase 6 to the main base 8, which is caused by the deformation of the insulator 7. The primary resonant frequency in the direction parallel to the recording surface of the optical disc 1 within the mechanical vibration of the subbase 6 is set lower than the rotation frequency of the optical disc 1. More specifically, the rotation frequency of the optical disc 1 is about 100 Hz, and the primary resonant frequency of the vibration of the subbase 6 is perpendicular to the direction in which the head is driven by the head driving mechanism (access direction). It is set at about 60 Hz for the direction.

The operation when the optical disc 1 having a large imbalance amount rotates at 100 Hz in the optical disc drive device of the first embodiment of the present invention configured as described above will be described below with reference to FIGS.

First, in the optical disc 1, the centrifugal force (referred to as an imbalance force) acts on the center of gravity G1, and its working direction turns with the rotation of the optical disc 1. The insulator 7 is deformed by the imbalance force F, and the subbase 6 and the entire assembly mounted on the subbase 6 vibrate at the rotational frequency of the optical disc 1. Here, the resonance frequency (about 60 Hz) of the subbase 6 due to the deformation of the insulator 7 is set lower than the rotation frequency (about 100 Hz) of the optical disc 1. As a result, the direction of displacement of the subbase 6 substantially always opposes the direction of action of the imbalance force F. Accordingly, the oscillation center axis P1 of the optical disk 1 rotating on the subbase 6, the center of gravity G1 of the optical disk 1 with the imbalance force F and the rotation center axis P0 of the spindle motor are shown in FIG. As described above, all are arranged in a straight line, and the center of gravity G1 of the optical disc 1 and the oscillation center axis P1 of the optical disc 1 are located on the same side with respect to the rotation center axis P0 of the spindle motor.

Under the above-described conditions, since the hollow annular portion 23 provided on the clamper 16a has its center aligned with the rotational axis P0 of the spindle motor 2, the center of the hollow annular portion, i.e., the outer circumference thereof. The center P2 of the wall 25 coincides with the central axis of rotation P0 of the spindle motor 2, and the hollow annular portion 23 swings around the central axis of rotation P1.

At this time, each of the spherical bodies 24 accommodated in the hollow annular portion 23 is acted by the centrifugal force q toward the center of gravity of the spherical body 24 in the direction connected to the swing center axis P1. Further, since the movement of each spherical body 24 is limited by the outer circumferential wall 25 of the hollow annular portion 23, the reaction N from the outer circumferential wall 25 is the center of the outer circumferential wall 25. It acts in the direction towards P2. As a result, the centrifugal force q and the moving force R as the resultant force of the reaction N act in the tangential direction of the circle having its center at the center P2 of the outer circumferential wall 25 and in a direction away from the swing center axis P1. With this movement force R, the spherical body 24 moves along the outer circumferential wall 25 and is collected at a position diagonally opposite to the center of gravity G1 of the optical disc 1 across the pivotal center axis P1.

As a result, the centrifugal force Q acting on the entire group of spherical bodies 24 is in a direction almost opposite to the unbalance force F acting on the center of gravity G of the optical disc 1, and the unbalance force F is displaced by the centrifugal force Q. And the force acting on the subbase 6 is reduced. The vibration generated in the subbase 6 when the unbalanced optical disc 1 rotates is thus suppressed.

Further, in the case where the hollow annular portion 23 is provided on the clamper 16a as in the first embodiment, since the space on the optical disc 1 on which several other components are located is used, the hollow annular ring The shape member 23 can be formed to have a large diameter so that the weight of the spherical body 24 or the number of the spherical bodies 24 can be increased; As a result, vibration on the optical disk having a large amount of imbalance can be sufficiently suppressed.

In the first embodiment, the primary resonant frequency in the direction parallel to the recording surface of the optical disc 1 in the mechanical vibration of the subbase 6 due to the deformation of the insulator 7 is the rotation frequency of the optical disc 1. Is set lower. This is because the direction of the vibration displacement of the optical disc 1 due to the imbalance force is approximately opposite to the action direction of the imbalance force.

In general, in a mechanical vibration system composed of a spring and a weight, it starts to occur near its resonance frequency between the frequency of the external force acting on the weight and the displacement due to the external force. At frequencies sufficiently higher than the resonant frequency, the phase shift is approximately 180 degrees in terms of electrical angle, where the direction of action of the external force is opposite to the displacement direction. That is, the resonant frequency of the subbase 6 is set lower than the rotation frequency of the optical disc 1, and at the frequency at which the direction of vibration displacement due to the unbalanced force is substantially opposite to the direction of action of the unbalanced force, the spherical body 24 Is gathered at a position diagonally opposite to the center of gravity G1 of the optical disc 1, and as described above, the direction of action of the centrifugal force Q acting on the spherical body 24 is approximately opposite to the direction of action of the imbalance force. . Therefore, the resonant frequency of the subbase 6 is preferably set by considering the direction of the vibration displacement caused by the imbalance of the rotational frequency of the optical disc 1.

Next, an optical disc drive device designed to record or reproduce by varying a constant linear velocity, that is, a rotation frequency between the inner and outer circumferences of the optical disc, or at a constant angular velocity while rotating the optical disc at a plurality of rotation frequencies instead of at a single rotation frequency In the optical disk drive apparatus for recording or reproducing, how the resonant frequency of the subbase 6 is set will be discussed.

Vibration and noise due to the imbalance of the disk 1 increase as the rotation frequency of the optical disk 1 increases. Therefore, a sufficient effect by the spherical balancer 22a cannot be obtained in the first embodiment unless at least the resonance frequency of the subbase 6 is set lower than the maximum rotation frequency of the optical disc 1.

In addition, the resonant frequency of the subbase 6 should not be set lower than the rotational frequency only when the vibration is small and does not adversely affect the operation of the optical disc drive device or the noise is sufficiently suppressed, and the vibration due to the imbalance force And the resonant frequency is preferably set sufficiently lower than the rotational frequency (e.g., 100 Hz) at which noise starts to cause problems.

In the first embodiment of the present invention, as described above, the direction of the vibration displacement of the optical disc 1 due to the imbalance force is one of the subbases 6 due to the deformation of the insulator (elastic material) 7. By setting the difference resonant frequency lower than the rotation frequency of the optical disc 1, it is set almost opposite to the direction of action of the imbalance force. Theoretically, the vibration displacement direction of the optical disc 1 due to the imbalance force is unbalanced by setting the primary resonant frequency (continuousness) of the elastic vibration generated in the spindle axis due to the unbalance force to be lower than the rotation frequency of the optical disc 1. It can be almost opposite to the direction of action of the force. However, if the primary resonant frequency of the elastic vibration of the spindle axis should be set lower than the rotational frequency (e.g. 100 Hz) where vibration and noise due to unbalance forces begin to cause problems, then the rigidity of the spindle axis will be It must be set lower than the level required by the drive, which causes a problem when the optical disc drive is to be driven by such a spindle axis. When a low rigid spindle axis is used, problems arise, for example, torsional vibrations generated in the spindle axis that stimulate the resonance of the optical disc 1.

On the other hand, in the first embodiment of the present invention, as described above, the primary resonant frequency of the subbase 6 caused by the deformation of the insulator (elastic material) 7 is set lower than the rotation frequency of the optical disc 1. The direction of vibration displacement of the optical disc 1 due to the imbalance force can be set almost opposite to the direction of action of the imbalance force. Therefore, the vibration suppressing effect of the spherical balancer 22a can be fully exhibited without reducing the rigidity of the spindle shaft 21.

In the first embodiment of the present invention, the center projection (center shaft) 17 provided on the clamper 16a is a hole into which the spindle shaft 21 of the spindle motor 2 is fitted, that is, a positioning hole 13. Positioning is performed by fitting into the same hole as (). As a result, in the optical disc drive device of the first embodiment, the center of the hollow annular portion 23 formed coaxially with the central projection (center axis) of the clamper 16a is the center of rotation of the spindle motor 2. Matches P0; As a result, the spherical bodies 24 are gathered at positions diagonally opposite to the center of gravity G1 of the optical disc 1, and the vibration suppressing effect can be increased.

As in the conventional optical disk drive shown in FIG. 24, the hole engaged with the clamper 116 is different from the hole in which the spindle shaft 21 is fixedly supported, or the positioning is provided on the turntable 110 If it is achieved by engaging the portion with the tapered portion provided on the clamper 116, the positional displacement between the center of rotation P0 of the spindle motor 2 and the center of the hollow annular portion is the displacement between the axes of the holes, the tapered portion This may increase due to specification errors. When the hollow annular portion 23 of this embodiment is provided on the clamper of such an optical disk drive, the following problem occurs.

2 and 3, the operation when the center of the hollow annular portion 23, that is, the center P2 of the outer circumferential wall 25 deviates from the rotation center axis P0 of the spindle motor 2, will be described. do.

FIG. 2 shows a case where the central axis P2 of the outer circumferential wall 25 coincides with the central axis of rotation P0 of the spindle motor; 3 shows a case where there is a displacement between these positions. In Fig. 2, the swing is made at the center P2 of the outer circumferential wall 25 held at the same position as the rotational center axis P0 of the spindle motor 2, and the center P2 of the outer circumferential wall 25 is a radius X1. It swings around the central axis P1.

In FIG. 3, the center P2 of the outer circumferential wall 25 is located at a position displaced by ΔX from the central axis of rotation P0 of the spindle motor 2, so that the center P2 of the outer circumferential wall 25 has a radius X2. Swings. In this state, when the weight of the spherical body 24 remains the same, the angle θ between the direction of the reaction N from the outer circumferential wall 25 and the direction of the centrifugal force q acting on the spherical body 24 increases. As the movement force R acting on each spherical body 24 increases, the angle θ also increases as the rotation radius X2 of the oscillation increases. In quantity, the amount of movement force R is proportional to the product of the rotation frequency and the rotation radius X2 of the oscillation. Thus, as shown in Fig. 3, when the rotational angle of oscillation decreases with the central axis P2 of the outer circumferential wall 25 displaced by ΔX from the rotational center axis P0 of the spindle motor, the rotational force R decreases. When the moving force R is reduced, the movement of the spherical body 24 is prevented due to the frictional resistance and rolling resistance along the bottom surface and the outer circumferential wall 25 of the hollow annular portion 23, which is spherical body This causes the phenomenon that the 24 does not gather at a position diagonally opposite to the center of gravity G1 of the optical disc 1. As described above, when the position displacement between the center of rotation P0 of the spindle motor 2 and the center of the hollow annular portion 23 is large, the vibration suppressing effect of the spherical body 24 is reduced.

In view of such a problem, in the first embodiment of the present invention, the center projection (center shaft) 17 provided on the clamper 16a for positioning the clamper 16a is provided with the spindle shaft ( 21) is configured to be achieved by engaging with a hole to be fitted, that is, a hole such as the positioning hole 13. Therefore, this configuration is located between the center of rotation P0 of the spindle motor 2 and the center of the hollow annular portion 23 formed coaxially with the central projection (center axis) 17 of the clamper 16a. Prevent displacement from occurring. Therefore, in the optical disc drive device of the first embodiment, the spherical bodies 24 are surely gathered at positions diagonally opposite to the center of gravity G1 of the optical disc 1, thereby enhancing the vibration suppressing effect.

Fig. 4 shows experimental results tested using the optical disc 1 in which the effect of the optical disc drive device of the first embodiment has an imbalance amount of about 1 gcm.

In this experiment, the vibration acceleration of the subbase 6 was actually measured when the optical disc 1 rotated at about 100 Hz. Part (a) of FIG. 4 shows a case of a conventional optical disk drive apparatus in which a spherical balancer is not mounted. As shown in part (a) of FIG. 4, in the conventional optical disk drive apparatus, the subbase 6 vibrates at a maximum acceleration of about 8G. Part (b) of FIG. 4 shows a case of the optical disk drive apparatus according to the first embodiment of the present invention; The vibration acceleration was reduced to about 3G.

In this way, in the optical disc drive device of the first embodiment, since the vibration acceleration is reduced, the lateral pressure applied to the bearing of the spindle motor 2 by the unbalance force F is reduced, and the bearing damage torque is increased. Solve problems of bearing damage, bearing life reduction, etc.

As described above, according to the configuration of the optical disk drive apparatus of the first embodiment, the vibration of the subbase 6 caused by the imbalance of the mounted optical disk 1 is effectively suppressed without increasing the rigidity of the insulator 7. Can be. Therefore, the optical disc drive device of the first embodiment is capable of stable recording or reproducing even when a largely unbalanced optical disc 1 is rotating at high speed, and is capable of high speed rotation without deteriorating vibration resistance and impact resistance. Can be achieved.

Second embodiment

Next, an optical disc driving apparatus according to a second embodiment of the present invention will be described with reference to the drawings. Fig. 5 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the second embodiment of the present invention. Fig. 6 is a plan sectional view showing only the hollow annular portion 23 provided on the clamper 16a in the optical disc drive device of the second embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus of the above-described first embodiment shown in Fig. 1 and in the optical disc driving apparatus shown in Figs. 24 and 25, and the description thereof is omitted.

According to the optical disc drive device of the second embodiment of the present invention, in the first embodiment, the spherical body 24 in the hollow annular portion 23 provided on the clamper 16a forms its liquid balancer 27 therein. It is replaced by the liquid 26 enclosed in. In this relationship, the configuration is the same as in the first embodiment described above. Fluids in which water, oil or fine particles are suspended are used as liquids.

In the optical disc drive device of the second embodiment configured as described above, when the optical disc 1 rotates with a large imbalance amount at 100 Hz, the entire base assembly mounted on the sub base 6 and the sub base 6 is the first. As in the case of the embodiment, due to an imbalance force acting on the center of gravity G1 of the optical disc 1, it is oscillated at the rotational frequency of the optical disc 1. In the optical disc drive device of the second embodiment, the resonance frequency (about 60 Hz) of the subbase 6 due to the deformation of the insulator 7 is due to the rotation frequency (100 Hz) of the optical disc 1, i.e., the imbalance force F. It is set lower than vibration frequency. As a result, the central axis P1 on which the optical disk 1 swings around is located between the center of gravity of the optical disk 1 on which the imbalance force F acts and the rotation center axis P0 of the spindle motor. Under these conditions, the liquid 26 enclosed in the hollow annular portion 23 provided on the clamper 16a is the swing center due to the centrifugal force Q acting radially from the swing center axis P1 toward the outer circumferential wall 25. Free axis 28 is formed at axis P1 with radius S from its center. Therefore, the liquid 26 is concentrated at a position diagonally opposite to the center of gravity G1 of the optical disk. Thus, as in the above-described first embodiment using the spherical body 24, the weight of the optical disc 1 by the centrifugal force Q acting on the liquid 26 concentrated at a position diagonally opposite to the center of gravity G1 of the optical disc. The imbalance force F acting on the center G1 is displaced. As a result, in the optical disk driving apparatus of the second embodiment, the vibration of the subbase 6 caused by the unbalanced force of the optical disk 1 is effectively suppressed.

In the second embodiment, liquid 26 was used in place of spherical body 24 functioning as a balancer in the first embodiment; The liquid 26 used in the second embodiment has a more centrifugal force Q acting on the liquid 26, assuming that the sphere 24 is a steel sphere compared to the sphere 24 used in the first embodiment. It is small because liquids generally have a low specific gravity. Therefore, in the optical disc drive device of the second embodiment, a large amount of liquid is required for the unbalance force F to be completely displaced. Therefore, when using liquid, it is desirable that the balancer be configured such that as much of the centrifugal force Q as possible is generated using the space allowed for the balancer in the apparatus.

The magnitude of the centrifugal force Q acting on the liquid 26 increases as the radius of the outer circumferential wall 25 of the hollow annular portion 23 and the volume of the liquid 26 enclosed therein increases; When both are limited, their size is determined by the specific gravity of the liquid and the radius S of the free surface 28. The radius S of the free water surface 28 increases as the center of the hollow annular portion 23 and the swing center axis P1 of the optical disk 1 increase, that is, as the rotation axis P1 of the swing increases. Therefore, if the center P2 of the hollow annular portion 23 is displaced by ΔX from the pivot center axis P0 of the spindle motor as shown in FIG. 3, the radius S of the free surface 28 is reduced accordingly.

However, in the optical disc drive device of the second embodiment, as in the first embodiment, the positioning is performed with the same hole as the positioning hole 13, that is, the hole in which the spindle shaft 21 of the spindle motor 2 is mounted. Achievement is achieved by engaging the central projection (center shaft) 17 provided on the clamper 16a, the positional displacement between the center of rotation P0 of the spindle motor 2 and the center P2 of the hollow annular portion 23. Almost eliminated. With this arrangement, the optical disk drive device of the second embodiment prevents the rotation radius X1 of the swinging from decreasing and allows the radius S of the free water surface 28 to be increased, so that a large centrifugal force Q can be generated within the limited volume.

Also, in the second embodiment, the liquid 26 is used instead of the spherical body 25 used as the balancer in the first embodiment; In the case of a liquid, since there are few elements that hinder its movement, the balancer can be reliably concentrated in a position opposite to the optical disc center of gravity G1, so that the stable effect of the optical disc drive device of the second embodiment can be obtained. . More specifically, when the imbalance is relatively low, or when performance with increased stability is required, a balancer using a liquid as in the second embodiment can obtain a greater effect.

The second embodiment deals with an example in which a liquid is used as the balancer, but it can be seen that if a liquid or powder mixed with a spherical shape is used, a similar effect to that of the second embodiment is obtained.

Third embodiment

Next, an optical disc driving apparatus according to a third embodiment of the present invention will be described with reference to the drawings. Fig. 7 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the third embodiment of the present invention. Fig. 8 is a plan sectional view showing hollow annular portions 23a and 23b provided on the clamper 16a in the optical disk drive device of the third embodiment. Here, the same reference numerals are given to substantially the same parts as the optical disc driving apparatus shown in FIGS. 24 and 25 or the optical disc driving apparatus of the first and second embodiments, and the description thereof is omitted.

In the third embodiment of the present invention, two hollow annular portions 23a coaxially with the central projection (center shaft) 17 formed on the clamper 16b for positioning with respect to the turntable 110. And 23b are provided. The first hollow annular portion 23a located on the inner circumferential side accommodates a plurality of spherical bodies 24 in a movable manner, and the second hollow annular portion 23b located on the outer circumferential side. Housed the liquid 26.

Accordingly, the spherical body 24 in the first hollow annular portion 23a and the liquid 26 in the second hollow annular portion 23b together constitute the balancer 29. This balancer 29 is formed integrally with the clamper 16b. This configuration is the same as in the first embodiment, and description thereof is omitted.

In the optical disc drive device of the third embodiment configured as described above, when the optical disc 1 having a large unbalance amount rotates at 100 Hz, the insulator 7 acts as the center of the center of gravity G1 of the optical disc 1. Deformed due to, the subbase 6 and the entire component assembly mounted on the subbase 6 oscillate at the rotational frequency of the optical disc 1 as in the case of the first embodiment.

In the third embodiment, since the resonant frequency (about 60 Hz) of the subbase 6 due to the deformation of the insulator 7 is set lower than the rotation frequency (about 100 Hz) of the optical disc 1, the subbase 6 Is always deformed in a direction approximately opposite to the direction of action of the imbalance force F. As a result, the oscillation center axis P1 of the optical disk 1 rotating on the subbase 6 is between the center of gravity G1 of the optical disk 1 with the imbalance force F and the rotation center axis P0 of the spindle motor. It is located as shown in 8.

In the optical disk drive device of the third embodiment, the first hollow annular portion 23a and the second hollow annular portion 23b provided on the clamper 16b are formed coaxially, and their center P2 is It is located approximately coaxial with the rotational center axis P0 of the spindle motor 2. As a result, the outer circumferential wall 25a of the first hollow annular portion 23a and the outer circumferential wall 25b of the second hollow annular portion 23b are the centers of rotation P0 of the spindle motor 2. And oscillate around the pivot center axis P1.

The plurality of spherical bodies 24 housed in the first hollow annular portion 23a are along the outer circumferential wall 25a due to the repulsive force of the outer circumferential wall 25a and the moving force R that is the resultant force of the centrifugal force qa. It moves and gathers at a position substantially diagonally opposite to the center of gravity G1 of the optical disc 1 across the oscillation center axis P1, and generates centrifugal force Qa as described in the first embodiment described above.

On the other hand, the liquid 26 enclosed in the second hollow annular portion 23b has a free surface of radius S centered at the pivotal center axis P1 by the action of the centrifugal force Qb as in the second embodiment described above. (28) will be formed. Thus, the liquid 26 is concentrated at a position approximately diagonally opposite to the optical disc center of gravity G1.

As a result, an imbalance force F acting on the center of gravity G of the optical disk 1 acts on the plurality of spherical bodies 24 and the liquid 26, which are located at approximately diagonal directions to the center of gravity G1 of the optical disk 1, respectively. Displaced by the centrifugal forces Qa and Qb, the vibration of the subbase 6 which occurs when the unbalanced optical disc 1 rotates is suppressed.

As in the above-described third embodiment, the first hollow annular portion 23a having the spherical body 24 contained therein and the second hollow annular portion sealed with the liquid 26 therein ( When 23b) is provided on the clamp 16b, each defect of the spherical balancer and the liquid balancer is compensated, and a better vibration suppression effect is obtained.

Next, the compensating action of the spherical balancer and the liquid balancer will be described with reference to FIGS. 8 and 9. 9 shows the positions of the spherical body 24 and the liquid 26 when the well-balanced, ideal optical disk is rotated.

When the largely unbalanced optical disc 1 rotates, the spherical body 24 and the liquid 26 are concentrated at positions substantially diagonally opposite to the center of gravity G1 of the optical disc, and the unbalanced force F is a spherical shape having a larger specific gravity. It is primarily displaced by the centrifugal force Qa acting on the upper body 24.

On the other hand, when the well-balanced, ideal optical disc 1 rotates, the spherical body 24 and the liquid 26 are unevenly distributed in position. In such a nonuniform position distribution, the clamper 16B may lose its balance by the spherical body 24 or the liquid 26 itself. Therefore, as shown in part (a) of FIG. 9, it is preferable that the plurality of spherical bodies 24 move to a mutually balanced position and the liquid 26 is uniformly distributed.

However, since the spherical bodies 24 are subjected to frictional resistance and rolling resistance along the bottom surface and the outer circumferential surface 25a of the first hollow annular portion 23a, the movement acting on the spherical body 24 if If the force R is smaller than these resistive forces, the movement of the spherical body 24 is disturbed. As described above in the description of the first embodiment, the moving force R acting on the spherical body 24 is such that the radius X1 of the rocking force increases as the imbalance force F increases, as shown in FIG. Therefore, in the case of the optical disc 1 which has almost no weight unbalance, the amount of imbalance based on the spherical body 24 itself is not raised to a certain level, for example, the spherical body 24 temporarily gathers in one place to cause an unbalanced state. As shown in part (a) of FIG. 9, the spherical bodies 24 cannot be moved to mutually unbalanced positions. In contrast, the liquid 26 encapsulated in the second hollow annular member 23b is less likely to interfere with its movement, and therefore, the liquid 26 must move even when the imbalance is small. Thus, as shown in part (b) of FIG. 9, even when the spherical body 24 cannot move to a desired position, the liquid 26 gathers in a position to correct the imbalance in the spherical body 24 itself, and thus Vibration can be suppressed.

As described above, according to the configuration of the third embodiment of the present invention, the vibration of the subbase 6 can be suppressed regardless of whether the weight of the optical disk 1 rotating at high speed is unbalanced or balanced; Therefore, the optical disc drive device of the third embodiment can stably record or reproduce on the optical disc 1 without generating noise, and the optical disc drive device can achieve high speed rotation.

Fourth embodiment

Next, an optical disc drive device according to a fourth embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 10 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device according to the fourth embodiment of the present invention. Here, the same reference numerals are given to the substantially same components as those in the first and second embodiments and the optical disk drive shown in Figs. 24 and 25, and the description thereof is omitted.

In the optical disk drive device of the fourth embodiment of the present invention, the spindle shaft 21 is fitted into the positioning hole 13 formed in the turntable 110 and passes through the positioning hole 13. The spindle shaft 21 penetrating the positioning hole 13 in the turntable 110 is inserted into the center hole 117 formed in the center of the clamper 16c, and the clamper 16c passes through the spindle shaft 21 passing therethrough. Is positioned.

The hollow annular portion 23 has a central hole 117 coaxially provided in the clamper 16c, and a plurality of spherical bodies 24 are housed in the hollow annular portion 23. Therefore, the hollow annular portion 23 and the spherical body 24 together constitute a spherical balancer 22b, and the spherical balancer 22b is formed integrally with the clamper 16c. In other respects, the configuration is the same as that described in the first embodiment.

In the optical disc drive device of the fourth embodiment configured as described above, when the optical disc 1 having a large imbalance amount rotates at 100 Hz, the optical disc rotates on the subbase 6 as in the first embodiment shown in FIG. The pivot axis P1 of (1) is located between the center of gravity G1 of the optical disk 1 on which the imbalance force F acts and the rotation center axis P0 of the spindle motor.

As shown in Fig. 10, the hollow annular portion 23 provided on the clamper 16c in the optical disk drive device of the fourth embodiment is formed coaxially with the center hole 117. As shown in Figs. In addition, the center hole 117 is formed so as to fit directly on the spindle shaft 21, which is the central axis of rotation of the spindle motor 2. Accordingly, the displacement ΔX of the center P2 of the outer circumferential wall 25 of the hollow annular portion 23 with respect to the rotation center axis P0 of the spindle motor 2 is almost as in the first embodiment already shown in FIG. It is set to zero. This is because, as described above in connection with the first embodiment, the vibration suppression of the spherical body 24 is due to the positional displacement between the center of rotation P0 of the spindle motor 2 and the center P2 of the hollow annular portion 23. It works to avoid the problem of decreasing effectiveness.

As described above, according to the configuration of the fourth embodiment of the present invention, the vibration suppression effect of the balancer using the spherical body 24 can be further enhanced.

Fifth Embodiment

Next, an optical disc driving apparatus according to a fifth embodiment of the present invention will be described with reference to the drawings. Fig. 11 is a sectional view showing the hollow annular portion 23 provided on the clamper in the optical disk drive device of the fifth embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

The optical disc drive device of the fifth embodiment of the present invention aims to reduce the amount of noise generated from the balancer itself, and as in the first embodiment already shown in Fig. 1, the spherical balancer 22c is integral with the clamper. Is formed.

As shown in FIG. 11, in the optical disk drive device of the fifth embodiment, the metal spherical bodies 24c and the plastic spherical bodies 24d arranged alternately are housed in the hollow annular portion 23. As shown in FIG. The other parts are the same as those in the above-described first embodiment.

In the optical disc drive device of the fifth embodiment configured as described above, when the optical disc 1 having a large unbalance amount rotates at 100 Hz, the metal spherical body 24c and the plastic spherical body 24d are described in the first embodiment. As described above, the moving force R acting on each spherical body is concentrated at a position diagonally opposite to the optical disk center of gravity G1. The resulting force Q of the centrifugal force acting on each spherical body acts to displace the imbalance force F acting on the optical disc center of gravity G1, so that the vibration of the subbase 6 in the optical disc drive device of the fifth embodiment is suppressed.

Next, when the optical disc 1 is stopped or when the optical disc 1 is accelerated toward the target rotation frequency from the stopped state or when the optical disc 1 is decelerated to decelerate, the rotation frequency is decreased. It describes the movement of the spherical body in the spherical balancer when it is lowered.

Naturally, when the disk 1 is in a stopped condition, no centrifugal force acts on the spherical body, and when the rotation frequency is low, the centrifugal force acting on the spherical body is small; As a result, a phenomenon in which the spherical body is not pressed against the outer circumferential wall 25 of the hollow annular member 23 may occur. Therefore, when vibration is applied from the outside during the conveyance of the optical disc drive device, or when the optical disc 1 is at the initial stage of the acceleration process or at the end of the acceleration process, the spherical body is formed inside the hollow annular portion 23. It is free to move and collide against the inner wall surface of the hollow annular portion 23 or against each other. As a result, if all spherical bodies are made of a hard material such as metal, collision noise will occur under the above-described conditions, and the noise level may be increased to an undesirable level.

Therefore, in the fifth embodiment of the present invention, as shown in Fig. 11, the metal spheres 24C are alternately arranged between the plastic spheres 24d having the low hardness, and thus at least the hard metal spheres. The possibility of the upper bodies 24c directly hitting each other can be avoided. With this arrangement, the optical disc drive device of the fifth embodiment can reduce the amount of noise generated when the optical disc 1 is in a stop condition or at the beginning of the acceleration process or at the end of the deceleration process.

Here, the plastic spherical body 24d may be formed entirely of a plastic material, but the same effect can be obtained when the plastic spherical body 24d is formed of a metal spherical body coated with a plastic material or dustproof rubber.

As described above, according to the configuration of the fifth embodiment of the present invention, it is possible to ensure stable recording or reproducing even when the optical disc having a large imbalance amount is rotating at high speed, and not only at high speed rotation but also upon acceleration of optical disc rotation or An optical disc drive device can be achieved that does not generate undesirable noise even during transportation of the device.

Sixth embodiment

Next, an optical disc driving apparatus according to a sixth embodiment of the present invention will be described with reference to the drawings. Fig. 12 is a sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device of the sixth embodiment of the present invention. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

In the optical disk drive device of the sixth embodiment of the present invention, the hollow annular portion 23 provided on the clamper 116 in the first embodiment is provided on the turntable 10. In the hollow annular portion 23 in the sixth embodiment, a plurality of spherical bodies 24 are housed in a movable manner. The clamper 116 used in the sixth embodiment is the same as that used in the optical disk drive shown in Figs. 24 and 25; In other words, the configuration of the sixth embodiment is the same as that of the first embodiment described above.

In the optical disc drive device of the sixth embodiment, a plurality of spherical bodies 24 are housed in a movable manner in the hollow annular portion 23. Therefore, since the hollow annular portion 23 is provided on the turntable 10 always integrally formed with the spindle shaft 21 of the spindle motor 2, the spindle motor of the hollow annular portion 23 is provided. It is easy to form the central axis of the hollow annular portion 23 so as to be coaxial with the rotational center axis P0. As a result, the displacement between the central axis P2 of the outer circumferential wall 25 of the hollow annular portion 23 and the rotation center axis P0 of the spindle motor can be effectively eliminated, and the effect of the ball balancer 22 is stable. Can also be kept consistent. In the sixth embodiment, the plurality of spherical bodies 24 are housed inside the annular portion 23 provided on the turntable 10, but if the liquid 26 is enclosed in place of the spherical body 24, It can be seen that the same effect is obtained.

Seventh embodiment

Next, an optical disc drive device according to a seventh embodiment of the present invention will be described with reference to the drawings. 13A and 13B are side sectional views showing the vicinity of the spindle motor 2 in the optical disc drive device of the seventh embodiment. FIG. 13A shows a state in which the optical disc 1 is in a stationary state or low speed rotation, while FIG. 13B shows a state in which the optical disc 1 is in high speed rotation. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

A seventh embodiment of the present invention relates to an optical disk drive apparatus capable of reducing the amount of noise generated from the balancer itself. As shown in Figs. 13A and 13B, the hollow annular portion 23c is provided on the turntable 10a, and a plurality of magnetic spherical bodies 24e are formed in the hollow annular portion 23c. It is stored inside. The spherical balancer 22d is composed of a hollow annular portion 23c and a magnetic spherical body 24e integrally formed with the turntable 10a.

In the optical disk drive device of the seventh embodiment, the annular magnet 30 is mounted on the inner circumferential side of the hollow annular portion 23c. Also, the clamper 116 used in the optical disc drive device of the seventh embodiment is the same as that used in the conventional optical disc drive device; In other words, the configuration is the same as that described in the first embodiment.

In the optical disc drive device of the seventh embodiment, a plurality of magnetic spherical bodies 24e are included in the hollow annular portion 23c, and the annular magnet 30 is the inner circumference of the hollow annular portion 23c. Since it is mounted on the side, the magnetic spherical body 24e operates to always receive a force in the direction of contact with the inner circumferential wall 31 of the hollow annular portion 23c by the suction force from the magnet 30. As a result, when the optical disc 1 is fixed, or when the rotational frequency of the optical disc 1 is at the beginning of the acceleration process or at the end of the deceleration process, when the centrifugal force acting on the magnetic spherical body 24e is small, the magnetic The spherical body 24e is made to adhere to the inner circumferential wall 31 of the hollow annular portion 23c by the suction force of the magnet 30 as shown in Fig. 13A.

Therefore, when vibration is applied from the outside during the conveyance of the optical disk drive device, or when the optical disk 1 is at the initial stage of the acceleration process or at the end of the deceleration process, as described in the description of the fifth embodiment, the spherical body They are prevented from colliding with the inner wall surface of the hollow annular portion 23c or with each other, and undesirable noise can be avoided.

On the other hand, the rotation frequency of the optical disk 1 is increased to the point where the vibration is generated by the imbalance of the optical disk 1, the magnetic spherical body 24e is hollow by its centrifugal force as shown in Fig. 13 (b) It is pressed against the outer circumferential wall 25c of the annular portion 23c.

For example, when the optical disc 1 is rotated and accelerated, the centrifugal force acting on the magnetic spherical body 24e also increases to the point that the suction force of the magnet 30 becomes larger than the inside, The magnetic spherical body 24e fixed to the circumferential wall 31 is thrown toward the outer circumferential wall 25c.

The rotational frequency at which the magnetic spherical body 24e is thrown toward the outer circumferential wall 25c is called fs, and the rotational frequency for generating the centrifugal force sufficient to press and hold the magnetic spherical body 24e with respect to the outer circumferential wall 25c. When f is a rotation frequency at which vibration caused by the imbalance of the optical disc 1 becomes undesirably large, it is preferable that the relationship between them be fh <fs <fn. That is, since fs is set sufficiently higher than fh, it is preferable that the magnetic spherical body 24e can be adsorbed and fixed even when vibration or shock is applied from the outside when the rotation frequency of the optical disc 1 is lower than fh. The amount of suction force at 30 is preferably set such that fs is lower than fn and exhibits the vibration suppressing effect of the spherical balancer 22c.

Further, in the optical disk drive device of the seventh embodiment, since the hollow annular portion 23c is provided on the turntable 10a fixed to the spindle shaft 21 of the spindle motor 2, the hollow annular portion It is easy to form such that the central axis of 23c is coaxial with the spindle motor rotational center axis P0 of the hollow annular portion 23c.

Thus, as shown in Fig. 3, the displacement ΔX between the center of rotation axis P0 of the spindle motor and the center P2 of the outer circumferential wall 25 is almost eliminated; This is because, as described in connection with the first embodiment, the vibration suppression of the spherical body 24 is due to the positional displacement between the center of rotation P0 of the spindle motor 2 and the center of the hollow annular portion 23. It acts to avoid the problem that the effect is reduced.

In addition, when a magnetic steel sphere having a large specific gravity is used as a spherical body housed inside the hollow annular portion 23c, it is possible to further enhance the effect of suppressing vibration caused by the imbalance.

As described above, according to the configuration of the seventh embodiment of the present invention, it is possible to ensure stable recording or reproducing even when the optical disc having a large imbalance amount is rotating at high speed, and not only at high speed rotation but also upon acceleration of optical disc rotation or An optical disc drive device can be achieved that does not generate undesirable noise even during transportation of the device.

Eighth embodiment

Next, an optical disc driving apparatus according to an eighth embodiment of the present invention will be described with reference to the drawings. Fig. 14 is a sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device of the eighth embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

In the optical disk drive device of the eighth embodiment of the present invention, as shown in Fig. 14, a hollow annular portion 23c is provided on the turntable 10b, and a plurality of magnetic spherical bodies 24e are hollow annular shapes. It is housed inside the portion 23c; A spherical balancer composed of the hollow annular portion 23c and the magnetic spherical body 24e is integrally formed with the turntable 10b.

In the optical disk drive device of the eighth embodiment, the annular magnet 30 is mounted on the outer circumferential side of the hollow annular portion 23c. About other parts, it is the same as the structure of 7th Embodiment mentioned above.

In the eighth embodiment configured as described above, as in the seventh embodiment described above, the magnetic spherical body 24e is formed by the suction force from the magnet 30, so that the magnetic spherical body 24e has a hollow annular portion ( Force is always applied in the direction of contact with the outer circumferential wall 25c of 23c. As a result, when the optical disc 1 is fixed, or when the rotation frequency of the optical disc 1 is late as in the initial stage of the optical disc rotation or the end of the deceleration process, and when the centrifugal force acting on the magnetic spherical body 24e is low, The magnetic spherical body is attached to the outer circumferential wall 25c of the hollow annular member 23c by the suction force of the magnet 30. Therefore, as in the seventh embodiment described above, when vibration is applied from the outside during the conveyance of the optical disc drive device, or when the optical disc 1 is at the initial stage of the acceleration process or at the end of the deceleration process, the spherical body is hollow. It is prevented from hitting against the inner wall surface of the annular portion 23c or between each other, and the occurrence of undesirable noise can be avoided.

In the optical disk drive device of the eighth embodiment, unlike in the seventh embodiment described above, the outer peripheral wall has a magnetic spherical body 24e regardless of the rotation frequency of the optical disk 1 and also when the optical disk 1 is fixed. It is kept in contact with 25c. Therefore, in the optical disk drive device of the eighth embodiment, if the magnet 30 is magnetized and the suction force of the magnet acting on the magnetic spherical body 24e is not excessive and is constant along the entire circumference of the outer circumferential wall 25c, The attraction force of the magnet 30 does not prevent the magnetic spherical body 24e from moving to the position opposite to the optical disk center of gravity G1, and a sufficient vibration suppressing effect can be obtained. Preferably, the magnet 30 is unipolar magnetized, for example, in the direction of the central axis of the outer circumferential wall 25c.

As described above, according to the configuration of the eighth embodiment of the present invention, stable recording and reproducing can be ensured even when the optical disc having a large imbalance amount is rotating at high speed, and at the time of acceleration of the optical disc rotation as well as at the high speed rotation, or An optical disc drive device can be achieved that does not generate undesirable noise even during transportation of the device.

9th embodiment

Next, an optical disc driving apparatus according to a ninth embodiment of the present invention will be described with reference to the drawings. Fig. 15 is a side sectional view showing the vicinity of the spindle motor 2 in the optical disc drive device of the ninth embodiment. Fig. 16 is a plan sectional view showing only the vicinity of the hollow annular portion 23c provided on the turntable 10c in the optical disk drive device of the ninth embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

As shown in Fig. 15 and Fig. 16, in the ninth embodiment of the present invention, a spherical annular portion 23c is provided on the turntable 10c and includes a sphere including a plurality of magnetic spherical bodies 24e. The shape balancer 22d is formed therein. The electromagnet 40 is mounted on the outside of the outer wall 43 of the hollow annular portion 23c. The electromagnet 40 includes an iron core 41 and a coil 42 wound around the center of the iron core 41. The iron core 41 has its inner end face facing the outer wall 43 of the hollow annular portion 23c at regular intervals therebetween, and is fixed to the subbase 6. In other respects, the configuration is the same as in the seventh embodiment described above.

In the ninth embodiment configured as described above, a magnetic field is formed by supplying a current through the coil 42, and thus a suction force is exerted on the magnetic spherical body 24e. By this suction force, the magnetic body 24e is exerted a force in the direction toward the outer circumferential wall 25c of the hollow annular member 23c. Therefore, when the optical disc 1 is fixed, or when the rotation frequency of the optical disc 1 is low at the beginning of the acceleration process or at the end of the deceleration process, and when the centrifugal force acting on the magnetic spherical body 24e is small, the magnetic The spherical body 24e adheres to the outer circumferential wall 25c of the hollow annular portion 23c by flowing a current through the coil 42. In the optical disc drive device of the ninth embodiment, the spherical body is thus prevented from hitting the inner wall surface of the hollow annular portion 23c or mutually.

Further, in the optical disk drive device of the ninth embodiment, when the optical disk 1 rotates at a high frequency that generates sufficient centrifugal force to cause the magnetic spherical body 24e to stick to the outer circumferential wall 25c, the coil ( Current to 42 is cut off. In this manner, the magnetic spherical body 24e is moved to a position opposite to the optical disk center of gravity G1, as in the first embodiment described above.

According to the structure of the optical disk drive device of the ninth embodiment, the amount of suction force applied to the magnetic spherical body 24e can be controlled by controlling the amount of current flowing through the coil 42, and between the suction state and the movable state. Switching at is easily possible by switching the current to the coil 42 on and off. Therefore, when suction is required, sufficient current flows into the coil 42, so that generation of noise due to magnetic spherical collision can be reliably prevented. In addition, when the optical disk 1 rotates at high speed, and when the vibration due to the imbalance force increases, the current to the coil 42 is cut off, whereby the magnetic body moves to a position opposite to the optical disk center of gravity G1. Allowing the vibration suppression effect to be fully utilized.

As described above, according to the configuration of the ninth embodiment of the present invention, stable recording and reproducing can be ensured even when the optical disc having a large unbalance amount is rotating at high speed, and at the time of high-speed rotation and acceleration of optical disc rotation, Alternatively, an optical disc drive device that does not generate undesirable noise even during transportation of the device can be achieved.

10th embodiment

Next, an optical disc driving apparatus according to a tenth embodiment of the present invention will be described with reference to the drawings. Fig. 17 is a plan sectional view showing only the vicinity of the turntable 110 in the optical disc drive device of the tenth embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

As shown in FIG. 17, in the tenth embodiment of the present invention, the opposing yoke 50 is fixed to the upper surface of the magnet 18. As shown in FIG. The outer radius of the opposing yoke 50 is larger than the outer radius of the magnet 18. An elastic body 52 such as dustproof rubber is attached around the outer circumferential surface 51 of the magnet 18. The other parts are the same as those described above in the first embodiment.

In the tenth embodiment configured as described above, the magnetic spherical body 24e is sucked and held by using the magnet 18, and the magnet is replaced with the optical disc 1 instead of the magnet 30 in the seventh embodiment shown in FIG. Generate a suction force to fix the position in position.

The magnetic spherical body 24e acts by the suction force from the magnet 18 so that the magnetic spherical body 24e is always forced in the direction toward the outer peripheral surface 51 of the magnet 18. As a result, when the optical disc 1 is fixed, or when the rotation frequency of the optical disc 1 is low, and when the centrifugal force acting on the magnetic spherical body 24e is small, the magnetic spherical body 24e is a magnet 18. It is made to be fixed to the elastic body 52 attached to the periphery of the outer peripheral surface 51 of the magnet 18 by the suction force of the (). Therefore, as in the seventh embodiment described above, when vibration is applied from the outside during the conveyance of the optical disc drive device, or when the optical disc 1 is at the initial stage of the acceleration process or at the end of the deceleration process, the spherical body is hollow. The inner wall surface of the annular portion 23d does not collide with each other or with each other, and undesirable occurrence of noise can be prevented.

The magnet 18 is magnetized in the vertical direction to generate sufficient suction force for fitting the optical disc 1. Therefore, the magnetic spherical body 24e is sucked and held by using the magnetic flux leaking to the side of the magnet 18, and the suction force acting on the magnetic spherical body 24e is between the magnet 18 and the opposing yoke 15. It is much smaller than the attraction force acting.

On the other hand, if the suction force acting between the magnet 18 and the opposing yoke 15 is too large, a very large force is required to overcome the suction force when removing the optical disk 1 from the turntable 110. As a result, the current consumption of the unloading loading motor (not shown) should be reduced, and in some cases, problems such as the optical disc unloading failure may occur. Therefore, it is not desirable to increase the amount of the magnetic field generated by the magnet 18, and if a suction force sufficient to attract and hold the magnetic spherical body 24e is to be obtained from the magnet 18, the magnet's side wall is increased. Leakage flux must be used as a whole.

For this reason, in the optical disc drive device of the tenth embodiment, the outer radius of the opposing yoke 50 fixed to the upper surface of the magnet 18 is formed larger than the outer radius of the magnet 18. According to such a configuration of the optical disc drive device of the tenth embodiment, when the rotation frequency of the optical disc 1 is low, the magnetic spherical body 24e is formed of an elastic body attached to the periphery of the outer peripheral surface 51 of the magnet 18 ( 52). That is, when the rotational frequency of the optical disk 1 is low, when the magnetic spherical body 24e tries to move away from the elastic body 52 due to the centrifugal force, the magnetic field is moved from the outer circumferential edge of the opposing yoke 50 to the magnetic spherical body 24e. Since the suction force is formed on the bottom surface of the magnet 18 through the magnetic sphere 24e continuously. Therefore, in the optical disk drive device of the tenth embodiment, the magnetic spherical body 24e is sucked and held until it reaches a high rotational frequency. That is, the optical disk drive device of the tenth embodiment is characterized in that the elastic body (e.g., until the magnetic spherical body 24e reaches a rotational frequency at which a centrifugal force sufficient to adhere to the outer circumferential wall 25d of the hollow annular portion 23d) is reached. 52, the magnetic spherical body 24e attached to it is held firmly.

When the rotation frequency of the disk 1 is low, the magnetic spherical body 24e stuck to the outer peripheral wall 25d is pulled to the outer peripheral surface 51 of the magnet 18 by the suction force of the magnet 18. At this time, since the elastic body 52 is attached to the circumference of the outer circumferential surface 51 of the magnet 18, the magnetic spherical body 24e does not directly hit the magnet 18, and the elastic body absorbs the impact. Bumped into (52). Therefore, the optical disc drive device of the tenth embodiment is not only a problem due to the shock when the rotation of the optical disc 1 is stopped, or when recording is performed by reducing the rotation frequency of the optical disc 1, or when the reproduction is performed. The occurrence of undesirable noise can be avoided.

Further, according to the tenth embodiment of the present invention, since the magnet 18 generating a suction force for holding the optical disk 1 is used to suck and hold the magnetic spherical body 24e, a separate to suck and hold them. No magnet is needed, so the number of components can be reduced.

Here, the elastic body 52 attached to the magnet 18 may be a cover made of, for example, a dustproof material, or may be made by covering the outer peripheral surface 51 of the magnet 18 with a dustproof material.

As described above, according to the structure of the tenth embodiment of the present invention, stable recording and reproducing are possible even when a large unbalanced optical disc is rotating at high speed, and the optical disc rotates as necessary as well as during acceleration or deceleration of the optical disc. By varying the speed, an optical disc drive apparatus that does not produce undesirable noise even when recording or reproducing is achieved.

Eleventh embodiment

Next, an optical disc drive device according to an eleventh embodiment of the present invention will be described with reference to the drawings. 18 is a plan sectional view showing only the vicinity of the turntable 110 in the optical disc drive device of the eleventh embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

In the configuration of the tenth embodiment described above, an elastic body 52 made of dustproof rubber or the like is attached around the outer circumferential surface 51 of the magnet 18; On the other hand, in the optical disk drive device of the eleventh embodiment of the present invention, the end face of the back yoke 50 in which the elastic body 53 made of dustproof rubber or the like protrudes to the outside of the outer circumferential surface 51 of the magnet 18 and It is also attached to the periphery of the lower surface portion. The other parts are the same as in the above-described tenth embodiment.

In the optical disc drive device of the eleventh embodiment configured as described above, since the elastic body 53 is also provided on the back yoke 50, occurrence of problems due to undesirable noise and impact can be avoided.

Even when the rotation frequency of the disk 1 slows down when the optical disk rotates, or when the magnetic spherical body 24e is pulled to the outer peripheral surface 51 of the magnet 18 by the suction force of the magnet 18, When the upper body 24e hits the end surface or the lower surface portion of the back yoke 50 instead of the elastic body 52 attached to the outer circumferential surface of the magnet 18, problems caused by undesirable noise or impact occur. This can be avoided.

When the disc 1 is placed in the horizontal position, the magnetic spherical body 24e is less likely to hit the back yoke 50 due to gravity, but especially when the optical disc 1 is held in the vertical position, the optical disc drive The device is placed in the longitudinal direction and there is a possibility that the magnetic spherical body 24e is pulled toward the back yoke 50.

As described above, according to the eleventh embodiment of the present invention, stable recording or reproducing is ensured even when a large unbalanced optical disc is rotating at high speed, regardless of whether the optical disc drive device is placed in a horizontal position or a vertical position. An optical disc drive device is achieved in which undesirable noise does not occur.

12th embodiment

Next, an optical disc driving apparatus according to a twelfth embodiment of the present invention will be described with reference to the drawings. Fig. 19 is a side sectional view showing only the vicinity of the spindle motor 2 in the optical disc drive device of the twelfth embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

In the optical disk drive device of the twelfth embodiment of the present invention, the turntable 10c for supporting the region 11 into which the optical disk 1 is fitted in a rotatable manner is shown in FIG. 19 of the spindle motor 2. It is fixed to the spindle shaft 21. In addition, a positioning taper 60 is formed on the side of the boss 114 of the turntable 10c, and a ring-shaped magnet 61 is embedded therein.

In the clamper 16e, a tapered hole 63 for centering the clamper 16e is formed by engaging on the positioning taper 60 formed on the turntable 10c. An annular opposing yoke 64 is fixed to the upper portion of the tapered hole 63.

Flat contacts 19 in contact with the disk 1 are formed on the lower surface of the clamper 16e. In addition, the clamper 16e is provided with a hollow annular portion 23e coaxial with the central axis of the tapered hole 63. Inside the hollow annular portion 23e, a plurality of metal spherical bodies 24e are housed in a movable manner, and a spherical shape including a hollow annular portion 23e and a magnetic spherical body 24e is provided. The balancer 22f is formed integrally with the clamper 16e.

When the optical disc 1 is fitted by the clamper 16e, the optical disc 1 is turned into a clamp hole 12 in the optical disc 1 engaged on the boss 114 of the turntable 10c. The phase is centered and maintained. The optical disc 1 is held in place by a suction force acting between the opposing yoke 64 fixed to the clamper 16e and the magnet 61 fixed to the turntable 10c. At this time, since the positioning is performed by the tapered hole 63 formed in the clamper 16e engaged with the positioning taper 60 provided on the turntable 10c, the center axis of the tapered hole 63 is the same. The hollow annular portion 23e provided as an accumulation is located substantially coaxially with the rotation center axis P0 of the spindle motor 2. In this manner, the clamper 16e which holds the optical disc 1 is driven by the spindle motor 2 to integrally rotate the turntable 10c and the optical disc 1.

In addition, as in the first embodiment described above, the optical disk drive device of the twelfth embodiment uses an insulator (elastic material) of low hardness to couple the subbase 6 to the main base 8. In the optical disc drive device of the twelfth embodiment, the primary resonance frequency in the direction parallel to the recording surface of the optical disc 1 is set to about 60 Hz within the mechanical vibration of the subbase 6 due to the deformation of the insulator 7. This is lower than the rotation frequency (about 100 Hz) of the optical disc 1.

In the twelfth embodiment configured as described above, when the optical disc 1 having a large unbalance amount rotates at about 100 Hz, the center of gravity of the optical disc is moved by the moving force R as in the above-described first embodiment shown in FIG. The magnetic spherical body 24e is concentrated at a position substantially diagonally opposite to G1. As a result, the imbalance force F acting on the optical disc center of gravity G1 is displaced by the centrifugal force Q acting on the magnetic spherical body 24e, and the vibration of the subbase 6 is suppressed.

In the optical disk drive device of the twelfth embodiment, since the magnetic spherical bodies 24e are acted upon by the suction force generated from the leakage magnetic flux from the opposing yoke 64 and the magnet 61, the magnetic spherical bodies 24e are always opposing yoke. Force is applied in the direction toward the outer end surface of (64). Therefore, when the optical disc 1 is stationary or when the rotation frequency of the optical disc 1 is low and the centrifugal force acting on the magnetic spherical body 24e is small, the magnetic spherical bodies 24e are separated from the opposing yoke 64. The suction force is caused to stick to the outer end surface of the opposing yoke 64.

As described above, in the optical disc drive device of the twelfth embodiment, as in the seventh embodiment described above, when vibration is applied from the outside during the conveyance of the optical disc drive device, or the optical disc 1 is at the beginning of the accelerating process. Alternatively, the spherical bodies are prevented from hitting each other or the inner wall surface of the hollow annular portion 23e when at the end of the deceleration process, and in this way the occurrence of undesirable noise is prevented.

As described above, in the optical disc drive device of the twelfth embodiment of the present invention, an optical disc loading mechanism comprising a turntable 10c provided with a magnet 61 and a clamper 16e provided with an opposing yoke 64 is provided. By using such an optical disk loading mechanism, a stable recording or reproduction is ensured even when a large unbalanced optical disk 1 rotates at a high speed, and an optical disk driving apparatus capable of preventing the occurrence of unnecessary noise can be achieved.

Thirteenth embodiment

Next, an optical disc driving apparatus according to a thirteenth embodiment of the present invention will be described with reference to the drawings. Fig. 20 is a side sectional view showing only the vicinity of the turntable 10c in the optical disc drive device of the thirteenth embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

In the optical disk drive device of the thirteenth embodiment of the present invention, as shown in Fig. 20, an elastic body 65 made of dustproof rubber or the like is attached along the circumference of the opposing yoke 64 shown in the configuration of the twelfth embodiment. . The other parts are the same as in the twelfth embodiment described above.

As described above, in the thirteenth embodiment, when the rotation frequency of the optical disk 1 is lowered at the time of deceleration of the optical disk rotation, the magnetic spherical body 24e is formed by the suction force from the opposing yoke 64. The magnetic spherical body 24e is prevented from directly hitting the opposing yoke 64 by being pulled to the outer end face and providing an elastic body 65 on the opposing yoke 64; Instead, the magnetic spherical body 24e hits the elastic body 65 that absorbs the impact, and thus the magnetic spherical body 24e is made to stick to the elastic body 65. In this way, problems due to undesirable noise and shock can be avoided.

As described above, in the optical disc drive device of the thirteenth embodiment of the present invention, an optical disc loading mechanism comprising a turntable 10c provided with a magnet 61 and a clamper 16e provided with an opposing yoke 64 is provided. By using such an optical disk loading mechanism, a stable recording or reproduction is ensured even when a large unbalanced optical disk 1 rotates at a high speed, and an optical disk driving apparatus capable of preventing the occurrence of unnecessary noise can be achieved.

Fourteenth embodiment

Next, an optical disc driving apparatus according to a fourteenth embodiment of the present invention will be described with reference to the drawings. Fig. 21 is a side sectional view showing only the vicinity of the turntable 110 in the optical disc drive device of the fourteenth embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

In the optical disc drive device of the fourteenth embodiment of the present invention, as shown in Fig. 21, the clamper 16f includes an upper case 70 and a lower case 71. The upper case 70 and the lower case 71 assemble together the outer circumferential side wall 73 of the lower case 71 located outside the outer circumferential side wall 72 of the upper case 70. The elastic body 74 is sandwiched between the outer peripheral side wall 72 of the upper tape 70 and the outer peripheral side wall 73 of the lower case 71 in close contact.

As shown in FIG. 21, the hollow annular portion 23f includes an upper inner surface of the upper case 70 of the clamper 16f, an inner surface of the outer circumferential side wall 72, and a bottom of the lower case 71. It is formed by the inner surface and the outer circumferential surface of the magnet 18, and a plurality of magnetic spherical bodies 24e are contained in the hollow annular portion 23f. In this manner, in the optical disc drive device of the fourteenth embodiment, the spherical balancer 22g formed of the hollow annular portion 23f and the magnetic spherical body 24e is formed integrally with the clamper 16f.

Further, in the optical disc drive device of the fourteenth embodiment, the back yoke 50 is fixed on the upper surface of the magnet 18, and as in the eleventh embodiment described above, the elastic body 53 is attached to the back yoke 50. It is firmly attached. In addition, the elastic body 52 is firmly attached to the outer circumferential surface 51 of the magnet 18. Other configurations are the same as those described in the first embodiment.

In the optical disk drive device of the fourteenth embodiment configured as described above, the optical disk 1 is fixed, or when the rotation frequency of the optical disk 1 is low during acceleration or deceleration, the centrifugal force acting on the magnetic spherical body 24e. When this is small, the magnetic spherical body 24e adheres to the elastic body 53 or the elastic body 52 by the suction force of the magnet 18 as in the eleventh embodiment described above. Under these conditions, when the rotation of the optical disc 1 is accelerated and the centrifugal force acting on the magnetic spherical body 24e increases to the point exceeding the suction force of the magnet 18, the elastic body 52 or the elastic body 53 The adherent spherical body 24e is pulled toward the outer circumferential wall 25f and hit the outer circumferential wall 25f.

The rotation frequency at which the magnetic spherical body 24e is pulled toward the outer circumferential wall 25f is fs, and the rotation frequency for generating the centrifugal force sufficient to hold the magnetic spherical body 24e attached to the outer circumferential wall 25f. Is fh, and the rotation frequency at which the vibration generated by the imbalance of the optical disc 1 becomes undesirably large is fn, the relationship therebetween is as described in the above-described seventh embodiment, where fh <fs <fn Is preferably set to. That is, even when vibration or shock is applied from the outside when the rotation frequency of the optical disk 1 is lower than fh, the suction force of the magnet 18 is increased and fs is higher than fh so that the magnetic spherical body 24e can be attracted and held firmly. It is preferable to set it high enough. However, the higher fs is set, the higher the rate at which the magnetic spherical body 24e collides with the outer circumferential wall 25f, and the likelihood that an impact caused by the collision of the magnetic spherical body 25e is transmitted to the optical disk 1. This causes the optical disc 1 to vibrate and adversely affects the recording and reproducing operation, or the collision noise is increased to an undesirable level.

To explain this, in the optical disk drive device of the fourteenth embodiment, the elastic member 74 is sandwiched between the outer circumferential wall 72 of the upper case 70 and the outer circumferential wall 73 of the upper case 71. By the buffering effect of the elastic body 74, the shock caused when the spherical body 24e strikes the outer circumferential wall 25f is absorbed, preventing the shock from being transmitted to the optical disk 1, and the amount of impact noise Will be reduced. Therefore, even if the suction force of the magnet 18 acting on the spherical body 24e is increased and the spherical body 24e is attracted and held when the rotation frequency of the optical disc 1 is low, the occurrence of a problem can be prevented, and the optical disc When the spherical body 24e strikes the outer circumferential wall 25f through the acceleration of the rotation of (1), it is possible to avoid the situation in which the adverse effect on the recording or reproducing operation is caused by the impact, and the level of collision noise is undesirable. It can be avoided to increase.

As described above, according to the configuration of the fourteenth embodiment of the present invention, stable recording or reproduction is ensured even when a large unbalanced optical disc is rotating at high speed, and an optical disc driving device when the optical disc is rotating at a fixed or low speed. Even if there is a vibration or an impact applied to the optical disk drive, it is possible to prevent the occurrence of undesirable noise.

Fifteenth embodiment

Next, an optical disc driving apparatus according to a fifteenth embodiment of the present invention will be described with reference to the drawings. Fig. 22 is a side sectional view showing only the vicinity of the turntable 110 in the optical disc drive device of the fifteenth embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted. As in the fourteenth embodiment described above, in the fifteenth embodiment of the present invention shown in Fig. 22, the hollow annular portion 23f has an upper inner surface and an outer circumferential side wall 72 of the upper case 70. And an inner surface of the lower case 71, an inner surface of the bottom of the lower case 71, and an outer circumferential surface of the magnet 18. As shown in Fig. 22, in the optical disk drive device of the fifteenth embodiment, the elastic body 75 is in close contact between the outer peripheral side wall 72 of the upper case 70 and the bottom inner surface of the lower case 71. It is fitted with The rest of the configuration is the same as in the fourteenth embodiment described above.

In the optical disk driving apparatus of the fifteenth embodiment configured as described above, similarly to the fourteenth embodiment described above, the outer peripheral wall 72 is caused when the magnetic spherical body 24e collides with the outer peripheral wall 25f. The vibration is buffered by the vibration buffering effect of the elastic body 75 sandwiched between the bottom upper surface of the lower case 71 and the lower end portion of the outer circumferential wall 72 of the upper case 70. Transmission is prevented and the amount of collision noise is reduced. Therefore, even when the optical disk is fixed or rotates at a low speed, even if vibration or shock is applied to the optical disk drive, even when the attraction force of the magnet 18 is increased to the extent that the magnetic material 24e can be attracted and held, a problem occurs. It can be prevented, avoiding a situation in which adverse effects on the recording or reproducing operation are caused by the impact when the magnetic material 24e strikes the outer circumferential wall 25f, and preventing the collision noise from increasing to an undesirable level. do.

Further, in the optical disc drive device of the fifteenth embodiment, the upper case 70 and the lower case 71 of the clamper 16f can be easily assembled as compared with the optical disc drive device of the fourteenth embodiment described above. In the optical disc drive device of the fifteenth embodiment, since there is no elastic body 74 between the outer circumferential side wall 72 of the upper case 70 and the outer circumferential side wall 73 of the lower case 71, the lower case ( By pressing the lower end of the outer circumferential wall 72 of the upper case 70 with respect to the elastic body 75 on the upper surface of the bottom of the 71 it was possible to assemble the cases.

As described above, according to the configuration of the fifteenth embodiment of the present invention, as in the fourteenth embodiment described above, stable recording or reproduction is ensured even when a large unbalanced optical disk is rotating at high speed, and the optical disk is fixed or Even if there is vibration or shock applied to the optical disk drive when rotating at a low speed, an optical disk drive can be achieved that can prevent the occurrence of undesirable noise.

Sixteenth embodiment

Next, an optical disc driving apparatus according to a sixteenth embodiment of the present invention will be described with reference to the drawings. Fig. 23 is a side sectional view showing only the vicinity of the spindle motor 2 in the optical disc drive device according to the sixteenth embodiment. Here, the same reference numerals are given to the same components as those in the optical disc driving apparatus in the first and second embodiments or the optical disc driving apparatus shown in Figs. 24 and 25, and the description of such portions is omitted.

In the optical disk drive device of the sixteenth embodiment of the present invention, a hollow annular portion 23g is provided on the rotor 80 of the spindle motor 2. In the hollow annular portion 23g of the sixteenth embodiment, a plurality of spherical bodies 24 are contained in a movable manner, and the hollow annular portions 23g and the spherical bodies 24 are spherical balancers ( 22f). The clamper 116 and the turntable 110 are the same as those used in the conventional optical disc drive device; In other respects, the configuration is the same as that described in the first embodiment.

As in the case of the first embodiment (Fig. 1) and the fourth embodiment (Fig. 10) and the seventh embodiment (Fig. 13) described above, the sixteenth embodiment has an outer circumference of the hollow annular portion 23g. It is an object to solve the problem that the central axis P2 of the wall 25g is displaced from the rotation center axis P0 of the spindle motor, and the hollow annular portion 23g is previously described with respect to the rotation center axis P0 of the spindle motor. By controlling the coaxiality, a stable effect of the spherical balancer 22f can be obtained consistently. In the sixteenth embodiment, the same effect is obtained if the liquid 26 is enclosed in the hollow annular portion 23g provided on the rotor 80 instead of the spherical body 24.

As in the optical disk driving apparatus of the sixteenth embodiment of the present invention shown in Fig. 23, the hollow annular portion 23g in which the plurality of spherical bodies 24 are movable is contained in the rotation axis P0 of the spindle motor 2. It is provided away from the optical disc 1 unbalanced in the direction of. In this case, the center of gravity of the subbase 6 and all the components mounted on the subbase 6 are indicated by the reference G2. The moments F and L1 around the center of gravity G2 of the whole assembly due to the imbalance force acting on the center of gravity G1 of the optical disc 1 are collected on the spherical body 24 at a position directly opposite to the direction of the unbalance force F. Compared with the moment Q · L2 around the center of gravity G2 due to the centrifugal force Q acting on, if the amount of centrifugal force Q and the unbalance force F are equal, the moment F · L1 of the unbalance force F is larger, which means that L1 is larger than L2. Because. The subbases 6 generate rotational vibrations due to their resulting moment M. Therefore, when rotational vibration becomes a problem, the hollow annular portion 23 is provided on, for example, an element near the optical disk 1 on the clamper 116 or the turntable 110, and the spherical body ( 24) or if the liquid 26 is placed therein, the difference between the moment F · L1 and the moment Q · L2 can be reduced.

Further, if the size of the hollow annular portion 23g is limited, and the weight of the spherical body 24 or the liquid 26 contained in the hollow annular portion 23g can be sufficiently large, or the optical disk If the imbalance amount in (1) is extremely large, the centrifugal force Q becomes smaller than the unbalance force F, and the difference between the moments F · L1 and the moments Q · L2 is increased. In this case, however, the distance L2 between the operating point of the center of gravity G2 and the centrifugal force Q is increased by forming the hollow annular portion, for example, on the upper portion of the clamper 116. If the difference between moments F · L1 and moments Q · L2 can be reduced in this way, the resulting moment M can be reduced. Therefore, even if the vibration in the direction parallel to the optical disk surface of the optical disk 1 can be sufficiently suppressed, the rotational vibration due to the resulting moment M can be reduced.

In the first to sixteenth embodiments, the action and effect when there is an imbalance in the optical disc 1 has been described, but any member rotated and driven by the spindle motor 2, the turntable 110, the spindle motor If there is an unbalanced state in the rotor or clamper 116 of (2), the effect of suppressing vibration due to this unbalanced state can also be obtained.

As described above, according to the optical disk drive device of the present invention, by providing a balancer containing a plurality of spherical bodies or liquids and rotatable integrally with the optical disk, vibration of the subbase due to the imbalance of the optical disk can be effectively suppressed. Even when the unbalanced optical disc rotates at a high speed, stable recording and reproducing are ensured, and an optical disc driving apparatus having excellent vibration resistance and impact resistance and capable of high-speed data transfer is achieved.

The optical disc drive device of the present invention suppresses vibrations due to weight imbalance such as an optical disc, and the present invention also drives all kinds of optical discs for reproducing data recorded on the optical disc or recording data on the optical disc while rotating the optical disc. It can be applied to the device. For example, the technical concept of the present invention is applied to a reproducing optical optical disc drive device for CD, CD-ROM, or a recordable device requiring more precise relative distance control (tracking control) between the track and the optical head on the optical disc. By doing so, a more reliable apparatus can be achieved.

In addition to devices that perform contactless recording or playback using optical heads, as well as devices that perform recording or playback on optical disks using floating magnetic heads or contact magnetic heads, undesirable vibrations due to optical disc imbalance can be avoided. Can be suppressed.

Claims (2)

A drive of an optical disc detachably mounted by a user to record or reproduce data: A sub base to which the spindle motor for optical disk rotation drive is fixed; A main base attached to the sub base through an elastic body having a function of absorbing vibration or shock from the outside; It is detachably mounted to be integrally rotatable with the optical disk for recording or reproducing data, and a balance member which exerts centrifugal force during rotation is hermetically sealed to be substantially coaxial with the central axis of rotation of the spindle motor. It has a balancer having a hollow annular portion having a central axis of The rotational frequency of the optical disc is set higher than the first resonant frequency of the swing vibration of the sub-base due to deformation of the elastic body so that centrifugal force acts on the balance member to move the balance member to a balanced position. , And said balancer reduces vibration by mass unbalance of said removable optical disc mounted by a user. An optical disc drive device detachably mounted by a user to record or reproduce data: A sub base to which the spindle motor for optical disk rotation drive is fixed; A main base attached to the sub base through an elastic body having a function of absorbing vibration or shock from the outside; It is detachably mounted to be integrally rotatable with the optical disk for recording or reproducing data, and a balance member which exerts centrifugal force during rotation is hermetically sealed to be substantially coaxial with the central axis of rotation of the spindle motor. It has a balancer having a hollow annular portion having a central axis of Deformation of the elastic body in the mechanical vibration in the direction in which the rotational frequency of the optical disk includes a surface parallel to the recording surface of the optical disk so that centrifugal force acts on the balance member to move the balance member to a balanced position. It is set higher than the first resonant frequency of the sub-base by, And said balancer reduces vibration by mass unbalance of said removable optical disc mounted by a user.